Tait TB8100 Service Manual page 142

12V 28V
28V
142 Power Amplifier Fault Finding
Final 1 or 2 Current High / Current Imbalance
1. Check that the load is not faulty.
2. Go to "60W Board" on page
recommend testing the splitter and combiner boards first (refer to
"Splitter and Combiner Boards (100W PA Only)" on page
Supply Voltage High or Low
Measure the supply voltage to the PA. If it is 10.8VDC to 16VDC, go to
"Boost Regulator Board (12V PA Only)" on page
the power supply. Note that the standard test voltage is 12.5VDC.
Measure the supply voltage to the PA. If it is 28VDC ±2V, go to
Board" on page 148. If it is not, check the PMU or power supply.
Driver Temperature High
1. Check that the alarm threshold is not too low (Configure > Alarms
> Thresholds). If the threshold is below the default value of 80°C,
increase the value and check whether the alarm is still present. If it
is, go to Step 2. If it is not, go to
2. Check the temperature of the PA with the Service Kit (Monitor >
Monitoring > Power Amplifier). If the temperature is too high, go
to "6W Board" on page
3. If the alarm threshold and PA temperature are correct, and the alarm
is still present, go to
Final 1 or 2 Temperature High
1. Check that the alarm threshold is not too low (Configure > Alarms
> Thresholds). If the threshold is below the default value of 90°C,
increase the value and check whether the alarm is still present. If it
is, go to Step 2. If it is not, go to
2. Check the temperature of the PA with the Service Kit (Monitor >
Monitoring > Power Amplifier). If the temperature is too high, go
to "60W Board" on page
3. If the alarm threshold and PA temperature are correct and the alarm
is still present, go to
162. If you are testing a 100W PA, we
"Visual Inspection" on page
155. If it is not, go to
"6W Board" on page
"Visual Inspection" on page
162. If it is not, go to
"60W Board" on page
© Tait Electronics Limited September 2006
160).
168. If it is not, check
"Control
144.
Step 3.
155.
144.
Step 3.
162.
TB8100 Service Manual